Unlike other languages, ruby is mainly driven by one application - Rails. As newer web FWs come, it's hard to see Rails keep up. The trends for Rails does not look good for the past 5 years [1]. I am hopeful that natalie [2] will work. If it does, it will remove the biggest downside to ruby.

[1] https://trends.google.com/trends/explore?date=today%205-y&q=...

[2] https://github.com/natalie-lang/natalie